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Securities - Investment Category and Length of Time in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 168 | 91
Number of Positions, 12 Months or More | security | 171 | 94
Number of Positions, Total | security | 339 | 185
Fair Value |  |
Fair Value, Less than 12 Months | $ 509,808 | $ 190,832
Fair Value, 12 Months or More | 312,698 | 183,115
Fair Value, Total | 822,506 | 373,947
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (5,163) | (2,234)
Unrealized Losses, 12 Months or More | (13,106) | (8,254)
Unrealized Losses, Total | $ (18,269) | $ (10,488)
Obligations of other U.S. Government agencies and corporations |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 0 |
Number of Positions, 12 Months or More | security | 2 |
Number of Positions, Total | security | 2 |
Fair Value |  |
Fair Value, Less than 12 Months | $ 0 |
Fair Value, 12 Months or More | 1,480 |
Fair Value, Total | 1,480 |
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | 0 |
Unrealized Losses, 12 Months or More | (38) |
Unrealized Losses, Total | $ (38) |
Obligations of states and political subdivisions |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 34 | 23
Number of Positions, 12 Months or More | security | 26 | 12
Number of Positions, Total | security | 60 | 35
Fair Value |  |
Fair Value, Less than 12 Months | $ 22,159 | $ 11,860
Fair Value, 12 Months or More | 16,775 | 7,728
Fair Value, Total | 38,934 | 19,588
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (193) | (59)
Unrealized Losses, 12 Months or More | (374) | (210)
Unrealized Losses, Total | $ (567) | $ (269)
Trust preferred securities |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 0 | 0
Number of Positions, 12 Months or More | security | 2 | 2
Number of Positions, Total | security | 2 | 2
Fair Value |  |
Fair Value, Less than 12 Months | $ 0 | $ 0
Fair Value, 12 Months or More | 10,633 | 9,388
Fair Value, Total | 10,633 | 9,388
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | 0 | 0
Unrealized Losses, 12 Months or More | (1,726) | (3,054)
Unrealized Losses, Total | $ (1,726) | $ (3,054)
Other debt securities |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 12 | 2
Number of Positions, 12 Months or More | security | 3 | 2
Number of Positions, Total | security | 15 | 4
Fair Value |  |
Fair Value, Less than 12 Months | $ 19,011 | $ 756
Fair Value, 12 Months or More | 5,621 | 6,308
Fair Value, Total | 24,632 | 7,064
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (88) | (12)
Unrealized Losses, 12 Months or More | (223) | (64)
Unrealized Losses, Total | $ (311) | $ (76)
Obligations of other U.S. Government agencies and corporations |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security |  | 1
Number of Positions, 12 Months or More | security |  | 2
Number of Positions, Total | security |  | 3
Fair Value |  |
Fair Value, Less than 12 Months |  | $ 497
Fair Value, 12 Months or More |  | 1,999
Fair Value, Total |  | 2,496
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months |  | (3)
Unrealized Losses, 12 Months or More |  | (27)
Unrealized Losses, Total |  | $ (30)
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 91 | 29
Number of Positions, 12 Months or More | security | 73 | 44
Number of Positions, Total | security | 164 | 73
Fair Value |  |
Fair Value, Less than 12 Months | $ 354,731 | $ 64,595
Fair Value, 12 Months or More | 125,757 | 89,414
Fair Value, Total | 480,488 | 154,009
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (3,945) | (659)
Unrealized Losses, 12 Months or More | (5,181) | (2,400)
Unrealized Losses, Total | $ (9,126) | $ (3,059)
Government agency mortgage backed securities | Commercial mortgage backed securities |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 5 | 2
Number of Positions, 12 Months or More | security | 4 | 3
Number of Positions, Total | security | 9 | 5
Fair Value |  |
Fair Value, Less than 12 Months | $ 6,506 | $ 5,629
Fair Value, 12 Months or More | 7,468 | 5,872
Fair Value, Total | 13,974 | 11,501
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (74) | (17)
Unrealized Losses, 12 Months or More | (310) | (217)
Unrealized Losses, Total | $ (384) | $ (234)
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 24 | 33
Number of Positions, 12 Months or More | security | 60 | 29
Number of Positions, Total | security | 84 | 62
Fair Value |  |
Fair Value, Less than 12 Months | $ 97,451 | $ 102,509
Fair Value, 12 Months or More | 140,076 | 62,406
Fair Value, Total | 237,527 | 164,915
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (840) | (1,470)
Unrealized Losses, 12 Months or More | (5,142) | (2,282)
Unrealized Losses, Total | $ (5,982) | $ (3,752)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities |  |
Number of Positions |  |
Number of Positions, Less than 12 Months | security | 2 | 1
Number of Positions, 12 Months or More | security | 1 | 0
Number of Positions, Total | security | 3 | 1
Fair Value |  |
Fair Value, Less than 12 Months | $ 9,950 | $ 4,986
Fair Value, 12 Months or More | 4,888 | 0
Fair Value, Total | 14,838 | 4,986
Unrealized Losses |  |
Unrealized Losses, Less than 12 Months | (23) | (14)
Unrealized Losses, 12 Months or More | (112) | 0
Unrealized Losses, Total | $ (135) | $ (14)

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